Archaeology of Qatar as a field study began in 1956. Three major expeditions were carried out in Qatar throughout the mid-20th century, with the first being launched by a Danish team who began work in the 1950s. This was followed by British and French expeditions in 1970s and 1980s, respectively. Approximately 200 archaeological sites were discovered during these expeditions, with the most extensive being the coastal areas of Al Da'asa, Ras Abrouq and Al Khor Island. Artifacts such as flint tools, Ubaid and Barbar pottery and encampments were found in situ.